I believe this is a Konobu chisel. I don't know the details. Please judge from the image of the inscription. This belonged to my father. He had other Konobu chisels as well. There is a large chip. A professional sharpening service quoted about 4000 yen for repair. I can introduce you to the sharpening service. - Type: Triangle chisel - Handle Material: Wood - Total Length: Approximately 230mm - Blade Condition: Used Thank you for looking.